广西钟山县珊瑚钨锡矿区及其外围找矿远景展望

简要阐述了珊瑚钨-锡矿区地质概况和成矿规律.根据该矿区及外围历年地质勘查及科研成果、矿山开采和生产勘探实际情况以及对珊瑚矿床成矿规律的研究,以我国华南钨-锡矿床成矿理论作指导,进行矿区深部及外围钨、锡资源二轮找矿远景预测,提出了四个钨、锡成矿预测区和一个成矿远景区的展望.     

作为赋存于花岗岩中钨锡矿化勘探指南的流体包裹体异常——前景展望

Studies of the distribution and abundance of fluid inclusions in granitic quartz associated with granite-hosted Sn-W mineralization of the British Isles reveal local and regional scale anomalies.At a sampling interval of c.5～50m,inclusion abundances increase towards zones of vein and stockwork mineralization exemplified by case history examples from exploration prospects in the Mourne Mountains of Northern Ireland and the Carrock Fell mining district of northwestern England.These steam aureoles provide a greater exploration target than the zone of visible alteration and mineralization and the lithogeochemical halo.But it is important to link them to geochemical data on fluid inclusion compositions,such as the semi-quantitative data from decrepitation-linked,ICP-AES (D-ICP)analysis,to optimize their exploration potential.Regional scale fluid inclusion anomalies,based on sampling intervals of c. 2km from the Sn-W mineralized granites of southwest England also broadly correlate with zones of intense mineralization in some areas. Regional-scale D-ICP analyses of quartz from SW England granites did not provide any convincing regional scale anomalies linked to mineralization except for positive boron anomalies around the centrally-mineralized Birch Tor area of the Dartmoor granite.Follow-up D-ICP analysis of quartz from stream sediments from this area,however,could be used to discriminate between samples related to mineralization from those draining unmineralized areas,using multivariate statistical analysis.At the present stage of development, the main contribution of fluid inclusion studies to mineral exploration is mostly limited to the conceptual stage where they continue to contribute to ore genetic theory and models.Costs and lack of knowledge transfer between research scientists and mineral explorationists limit their direct use during regional and target selection stages of exploration.Analysis of steam sediment quartz,using the more sensitive ICP-MS technique as a variant of the D-ICP method,appears to offer the greatest potential for future development as an exploration tool.     

南岭稀土花岗岩、钨锡花岗岩及其成矿作用的对比

南岭地区的钨锡和稀土矿床都与花岗岩类有直接成因联系,但二者的成矿作用有许多不同之处.钨锡是典型的热液成矿,而稀土则主要形成于风化作用.随着花岗岩类的分异演化,岩石中的W、Sn等元素含量逐渐增加,因此钨锡等矿床主要与高度分异演化的晚阶段小岩体有关;但是稀土的表现与钨锡不同,由于花岗岩类的分异演化导致稀土栽体黑云母及许多副矿物的减少,因此稀土元素含量在晚阶段岩体中反而降低.赣南的五里亭-大吉山岩体、桂东北的花山-姑婆山岩体等提供了很好的范例.因此,南岭地区与风化壳型稀土矿床有关的岩石主要有:印支期准铝质花岗岩,燕山期A型花岗岩,燕山中-晚期黑云母二长花岗岩等.     

芙蓉锡矿田骑田岭花岗岩黑云母矿物化学组成及其对锡成矿的指示意义

芙蓉锡矿田骑田岭复式岩体主要由早阶段角闪石黑云母花岗岩和晚阶段黑云母花岗岩组成.电子探针分析结果表明角闪石黑云母花岗岩中的黑云母属于铁黑云母,黑云母花岗岩中的黑云母属于铁叶云母.相对于黑云母花岗岩,角闪石黑云母花岗岩中黑云母的MgO、TiO2含量偏高,Al2O3含量偏低.矿物化学研究结果显示,角闪石黑云母花岗岩中黑云母的结晶温度、氧逸度(logfO2)分别为680℃～740℃、-16.00～-15.31,黑云母花岗岩中黑云母的结晶温度、氧逸度分别为530℃～650℃、-19.20～-17.50.从角闪石黑云母花岗岩到黑云母花岗岩,岩浆结晶温度和氧逸度逐渐降低.与花岗岩有关的共存流体性质的研究发现,与角闪石黑云母花岗岩共存的热液流体log(fH2O/fHF)fluid,log(fH2O/fHCl)fluid,log(fHF/fHCl)fiuid值分别为4.22～4.39,2.78～3.24,-1.82～-1.73,而与黑云母花岗岩共存的热液流体log(fH2O/fHF)fluid,log(fH2OfHCl)fluid,log(fHF/fHCl)fluid值分别为3.27～3.53,2.85～3.22,-0.75～-0.22,可见与两种岩石类型共存热液流体的性质存在明显差异,且热液中Cl、Sn含量变化与岩浆结晶分异指数呈正相关关系.骑田岭岩体从角闪石黑云母花岗岩到黑云母花岗岩,随着岩浆的演化.岩浆结晶期后分异出的热液流体向富Cl和Sn方向演化.芙蓉锡矿田的成矿流体应主要来源于黑云母花岗岩岩浆结晶期后分异出的岩浆热液.     

黑龙江省翠中铁钨多金属矿床成岩成矿年代学、地球化学特征及地质意义

为了厘清翠中铁钨多金属矿床浅部的粗粒碱长花岗岩和深部的细粒碱长花岗岩与成矿之间的关系，本次工作对这2种岩浆岩分别进行了岩石地球化学、锆石U-Pb年代学和Hf同位素分析，对岩石和矿石开展了Pb同位素研究.粗粒碱长花岗岩和细粒碱长花岗岩的锆石U-Pb年龄分别为503±2.9 Ma和201±6.4 Ma，表明其侵入时代分别为加里东中期和印支晚期-燕山早期.辉钼矿Re-Os同位素模式年龄为202±2.9 Ma，与细粒碱长花岗岩锆石U-Pb年龄基本一致.粗粒碱长花岗岩中锆石的ε_Hf（t）值变化于-8.31~0.57，指示其来源于中元古代古老地壳部分熔融，细粒碱长花岗岩中锆石的ε_Hf（t）值为2.84~4.78，表明其起源于亏损地幔中新增生的年轻地壳物质的部分熔融.综合成岩成矿时代、成矿元素趋势面分析以及岩矿石Pb同位素对比，我们认为翠中铁钨多金属矿床的成矿作用与深部的细粒碱长花岗岩有关.结合区域构造演化历史，推测成矿作用可能形成于佳木斯地块向松嫩地块俯冲挤压的构造环境.      

钨矿床研究态势

钨在地球历史演化中,逐渐向地壳分异宙集。在成矿历史演化中,钨在显生宙成矿具多发性,尤以海西期和燕山期最为重要。尽眢现代同生成矿理论最初开始于对欧洲层状白钨矿床的研究,但近些年来,越来越多研究证明绝大多数钨矿床在成因上与花岗质岩体关系密切,甚至包括层控钨矿床的发祥地。本文还明确提出了与I型花岗岩、S型花岗岩、过渡型花岗岩有关的三个钨矿床成矿系统,并对比其基本特点。近些年来,探索钨矿床成矿的构造环境是另一个重要走向。     

江西省小龙钨矿深部地球化学找矿远景预测

运用岩石地球化学找矿方法预测了小龙钨矿区深部Ｃｕ、Ａｇ、Ｗ矿化富集规律及其找矿远景。认为矿区南涪７、１１勘探线八中段以下存在Ｃｕ、Ａｇ、Ｗ矿体可能;北部０勘探线六中段Ｃｕ、Ａｇ晕已收敛,深部存在Ｃｕ、Ａｇ矿体可能性不大,而Ｗ的强度和规模在八中段以下呈显著增大趋势,深部可能存在Ｗ矿体,为矿区深部部署坑道工程提供了准确的地球化学依据。     

某钽铌钨铍矿化花岗岩岩石化学特征

During the magmatie evolution from biotite granite through two-mlca granite to mineralized muscovite granite it has been noted that Na^ , Mm^2 , Si^4 increase while K^ , Ca^2 , Mg^2 , Fe^2 , Fe^3 , Ti^4 , and P^5 decrease systematically in this district. Oreforming metals occur in higher abundance in biotite granite which is thought to be the representative of primary magma, and have been enriched rapidly with magmatic evolution R^ /R^2 Na^ /K^ , Rb/K, Mn/Fe and other petrochemical parameters increase whereas Ti^4 /Si^4 decreases in a sympathetic way with the enrichment of niobium and tantalum, providing good indicators of the degree of differentiation and metasematism of the magma ,Within the mineralized granite, there is a same trend of variation upward whioh is found closely related to the enrichment of tantalum. Fluorine is strongly concentrated in wall rocks above blind mineralized granite, and the eontente of tantalum and niobium in wolframite from quartz veins genetically related to the granite increase towards buried mineralization. The latter two phenomena are suggested by the author as clues to buried ore bodies.     

某地钽铌钨铍矿化花岗岩

The tantalum-, niobium-, tungsten-, beryllium-mineralized granite described in this paper is identified as albitizied fine-grained muscovite granite and occurs as a small discordant taeolity with a bulging central part, dipping and finning out outwards.A crust of quartz-pegmatoid, several tens of centimeters thick, dsvelopes in its apices. Major rock-forming minerals are plagioclase, mierocline, albite, muscovite and quartz. Partsehinite, fluorite and topaz are characteristically abundant among accessory minerals. Rare element and base metal minerals include wolframite,scbeellte, microlite, raanganese-rich columbite, berly, phenacite, xenotirae, monazite,cassitcrite, raolybdenite, bisrauthinite, etc. Niobium and beryllium mineralizations are uniformly present throughout the rock body, but tantalum is feund richer in upper parts than in lower parts. It is tentatively suggested that this is a differentiationmctasomatic deposit of fracture-filling type originated during late magmatic stage.     

用多孔聚钨磷酸盐X荧光法测定磷酸中铀

本文介绍了测定磷酸中铀的工作曲线法，将磷酸中铀吸附在多孔聚钨磷酸盐上，这样制备的样品很薄，非常适合于X荧光法分析。